refrigeration alarm system

Our D3 Wireless Temperature Monitoring system automatically monitors temperature, humidity and other factors and will alert you when anything is out of range. Ideal as a Refrigeration Alarm System.

This affordable wireless temperature monitoring system is a durable and reliable technology. Helping you stay HACCP, BRC & MHRA compliant. The D3's versatility and range of functions makes it suitable for many applications.

Made in the UK. Exclusively available in Northern Ireland from Tendo Systems.

Refrigeration Monitoring and Alarm System - At a glance...

  • Wall mounted touch-screen base unit

  • Alarms via email / SMS

  • Audit-ready reports produced

  • No more manual temperature records

  • Assists compliance with industry standards

  • No WiFi required

  • No software installation required

  • No on-going payments

  • Annual calibration service available

Wireless Sensor / Transmitter

  • 250 metre range

  • 5 year battery, easily replaced

  • Transmits reading every 60 seconds

  • Temperature range: -200 to +200°C

  • Water resistant to IP68

Refrigeration Alarm System

Not just temperature...

wireless temperature monitoring and more...

It's not just temperature. The D3 also monitors Relative Humidity | Energy Kwh | Door Sensors | Pulse Sensors | Concentration (ppm) | Digital Input | Linear (4-20mA / 0-10v)

Email / SMS Alerts

Tendo Systems D3 Alerts


Our D3 temperature monitoring system is designed to be compliant with stringent industry standards including;

FDA 21 CFR Part 11
UKAS ISO 17025
Calibration available from factory

Wireless Monitoring FAQ

How are the wireless sensors/transmitters powered?

Our Wireless Transmitters are powered by an AA size Lithium battery. The batteries will last up to 5 years and they are easily replaced.

As a transmitter’s battery level reduces, you will see visual indication on your computer / smartphone screen.  When the level drops to a critical level, you will receive an email alert.

If you require annual calibration / maintenance services, we will check the level of charge in your batteries and replace them as part of the service.

How much does a wireless temperature monitoring system cost?

There are many variables. The answer depends on the quantity and type of sensors you need. It also depends on the size of your facility and if Repeaters (signal boosters) are required.

We can talk you through this via phone or email. Or, you can complete this Estimate Request form and we’ll get back to you ASAP.

What is the maximum range of a temperature sensor/transmitter?

Our wireless sensors can transmit up to 1km outdoors, with no obstacles. When inside buildings, the range can be around 300 metres. This depends on walls and other obstacles.

We can install Repeater units to increase the signal range. These Repeaters can be daisy-chained and so the transmission range of a wireless sensor can be increased as required.

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